Rotary grate.



Patented .Iuly 3|, |900. H. H. HUNTER.

ROTARY GBATE. (Application led Dec. l1, 1899.) (No nodal.)

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Nrrnn STATES i ATENT innen ROTARY G RATE.

SPECIFICATION forming part of Letters Patent No. 655,086, dated July 31,1900.

Application led December 11,1899. Serial No. 7391956. (No model') To @ZZwhom t may concern.'

Be it known that I, HENRY H. HUN'rnma citizen of the United States,residing atBerkeley Springs, in the county of Morgan and State of WestVirginia, have invented new and useful Improvements in Rotary Grates, ofwhich the following is a specication.

My invention relatesto rotary grates for stoves, the object of the samebeing to provide means whereby comminuted particles or fine grades ofanthracite coal may be burned satisfactorily and the heat thereofutilized. It is a well-known fact that the finer the grade of the coalthe greater the draft that is necessary in order to eectually `consumethe same. ings therethrough are of large enough size to furnishsufficient draft they are too largeto support the fine particles ofcoal.The result is that lthese fine grades of coal cannot be satisfactorilyburned, because in the one case there is insufficient draft and in theother case there is a danger that the bed of coals will fall entirelythrough the grate ,into thejashpan without being consumed. One of themethods which has been devised vfor overcoming this objection is tocover the grate, which is provided with openings of sufficient size,

with large coal and introduce the smaller grade of coal onto the top ofthis large coal. It has been found, however, that even when this hasbeen done the small 4coal will fall down into the grate as soon as thelarge coal,

which originally bridged across these jcpenings, has burned out. f

By my invention I provide means whereby the size of the openings throughthe grate mayy and Fig. 3 is a bottom plan view showing thegrate-sections in different relative positions.

With the ordinary grates if the openstrengthening ribs 7.

.ferred to.

radially-extending ribs l2 13.

Like reference-numerals indicate like parts vided with a large centralcircular opening 2. l In this opening fits and is adapted to move myimprovedrotary grate. The same consists of two annular members 3 and 4,re-

spectively, the lower member 3 being supported with provision for rotarymovement upon inwardly-extending lugs or projections 5 5.. It is alsoprovided with a series of radially-extending elongated slots 6 6,between which are secured the depending bracing and On' one side thesec.- tion 3 has secured to or formed integral with italaterally-projecting arm 8, which consti- Atutes a handle and lieswit-hin a recess or cutaway portion 9 in the uppersurface of thepartition 1. The other annular section 4 of my improved grate isdisposed upon the upper side of the section 3, in close contacttherewith, and is provided with a laterally-extending arm or handle 10,whiehalso fits and moves within the recess or cut-away portion 9,heretofore rewith `a series of radially-extending elongated slots 1l 11,which are adapted to register with the slots 6 6 in the section 3 whenthe handles 8 and 10 of the two sections are in alinement one with theother. Between the slots l1 and secured to the upper side of thesection4are The ribs 12 have their upper surfaces parallel with theupper surface of the section 4 and are arranged alternately between theribs 13. The latter ribs are formed with upwardly-extending curvedprojections 14 thereon, the proj ections on the alternate ribs 13 beingformed on opposite ends thereof-that is, the projection 14 on one of theribs 13 will be located at the inner end thereof and on the adjacent rib13 will be on the outer end thereof, Secured to the section 4 of thegrate and extending upwardly therefrom is a hollow substantiallycone-shaped dome 15, provided with a series of elongated slots 16 at itslower end, arranged opposite the spaces between the slots 11 in thesection 4. Said section 4 is held in place with provision for rotarymovement by means of a central axial rod 17, se

The section 4is further providedV IOC foru'se with coal of dierentfineness. Vil/'hen the handles 8 and lO-of the two sections are in linewith each other, the slots lland 6 register one with the other, Vand thedraft, evenly divided throughout the entire surface'ot the grate, issupplied' to the fuel through the slots t 6 and 11Y and also through theslots 16 in the `cone-.shaped dome l5. The draft'through the E I' slots16 is always unobstructed, so that nog ymatter what the relativepositions ofthe seci tions 3 and 4 may be a draft to support thecombustion is supplied.y In starting a? fire; -with culm orfinely-divided particles of coal `itis-found desirable to move the'sections 3f -and 4 of the grate so that the slots or pas-r sagestherethrough are completely closed,and the entire draft is then suppliedthrough the slots 16. When it is desired to shake the grate., thehandles 8 andlO are grasped by the hand and both sections Sand 4 rockedsimultaneously The peculiar shape and arrangement of] the ribs 12-and13, with the projecftions'14 on the latter, serve to remove or "breakupany clinkers that may be upon the upper-surface of the section 4 andcause the same to pass down through the passages ini the grate intotheash-pan below. They also `serve to generally change the position ofvthe fuel. 'By' reason of the fact, as stated above, that Vthe dome 15is secured to the upper section 4 of the grate it willfbe observed thatthe ro- Y Tl. A grate comprising two rotary sections mounted one uponthe other and provided with slots .adapted to register one with the@other, and a substantially cone-shaped dome i secured tothe upper ofsaidsections and pro- `I claim, and desire to secure by Letters Patvidedwith a series of slots 'in the sidesthereof for the passage ofair abovesaid sections.

2. A grate comprising two rotary sections `disposed one upon the'otherand'provided with elongated slotswadaptedY to .register with each other,a substantially cone-shaped dome on the upperv of said sections,provided with a series of slots or passages for supplying air Yabovesaid'se'ctions, and means for moving said sections independently forcontrolling the size of thepassages through saidslots.

-5 Agrate comprising two annular'rotary sections disposed one upon theother, and

' provided with elongated slots adapted'to reg- :thesize of the passagestherethrough.

4. The combination withv a diaphragm or partition having a centralcircular opening therein, of a vgrate comprising two annular sectionsdisposed one upon the other, tting Yand adapted to rotatein said openingand provided with radi'ally-extendin g slots adapted to yregisterwi-theach other, laterally-extending arms on each of said sectionsconsti- 'tuting handles therefor, by means of`which said sections may berotated simultaneously or moved independently, and a hollowsubstantially cone-shaped dome Vsecured tothe upper of said sections andprovided with a series of slots or openings in the sides thereof for thesupply of air above said sections.

5. In a grate, two annular sections disposed one upon the other andprovided with slots i adapted to register with each other, `a sub-`st-antially cone-shaped dome secured to the upper of said sectionsandlprovided with a ser-ies of slots or openings for supplying-air abovesaid sections, and radially-extending ribs 12, 13 secured to the topsurface of the upper of said sections between the slots therein, theribs'l2 having their`upper surfaces parallel with thesection to whichthey are secured and arranged alternately between the ribs 13, and thelattery having upwardly-extending curved projections 14 arrangedalternately at opposite ends of said ribs 13.

In testimony whereof I have hereunto set my hand in presence of twolsubscribing witnesses. v

HENRY H. HUNTER.

Witnesses: Y

CHAs H. SnocKEY,

JAS. F. SMITH. Y

lOl

IIO

